_ the police arrived, the alien left the ground A:before,B:

_ the police arrived, the alien left the ground A:before,B: Before the police arrived,the alien left the shop and then v Before the police arrived,the alien left the shop.(为什么选择arri Before the police arrived,the alien left the shop ,句中能用when或 whwn the police arrived the aline left the ground 为什么用when而不 While the alien ____ a souvenir ,the girl called the police 1.The girl called the police while the alien was buying a so When the police arrived ,the man for10 minutes A died B was A traffic accident happened in the street.The police arrived The police arrived quickly,_______ it was too late.A and B b There was a police officer ( ) on the ground By the time the doctor arrived ,the man _ already.A.died B.h